Alloy for armor-plates and other uses.



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plates.

tINiT STATES PATENT onnrcn.

ALLOY FOR ARMOR PLATES: USES;

Specification of Letters Patent. Patented Sept, 21, 1909.-

No Drawing. Original application fi1ed.August 2, 1907, Serial No. 386,834. Divided and this application filed May 3, 1909. Serial No. 493,709.

To all whom 'it may concern:

Be it known that I, EUGENE SCHNEIDER, of Le Creusot, Saone et Loire, France, have invented a new and useful Improvement in Alloys for Armor-Plates and other Uses, which invention is fully set forth in the following specification. v

The cementation of armor lates has resulted in considerably increasing the resistance offered to projectiles relatively to that obtaining with the homogeneous armor plates previously employed;' so that recourse is now alwa s had to cemented armor plates hardened 5y different processes, for the purpose of opposing the passage of projectiles at high velocities andv effecting their frac ture by shock upon the impact face of such Although presenting great resistance to unca ped projectiles, cemented armor plates 0 er but a relatively small re sistance and one which is far from uniform when they are attacked by capped projectiles; in this case they present little superiority over uncemented plates of equal thickness.

In a copending application filed August 2, 1907 Serial No. 886,834, (Patent No. 925,659,

June 22, 1909) of which the present application is a division, I have described and claimed alloys by means of which it is possible to form homogeneous armor plates giving results superior to those obtained with cemented plates.

The present invention relates to alloys of the class referred to and to particular alloys of said class. The homogeneous armor plates manufactured with these alloys present a more uniform resistance to the attack of uncapped projectiles and they also offer greater resistance to capped projectiles than the best armor plates heretofore known.

The improved alloys are constituted in the following manner: A steel comprising, in

addition to the iron, per hundred parts Carbon 0.30 to 0.50 Manganese less than 0.350 Nickel 3 to 5 Chromium 0.5 to 1.5

and while the metal is in fusion from 0.5 to- -1.5% of molybdenum or 1 to 3% of tungsten, or again, 0.2 to 0.5% of vanadium is added thereto.

Instead of adding one only of the metals steel are reduced in a proportionate manner as regards each of them.

The composition of the steel, indicated I above, is that which gives the best results in practice, but it is nevertheless capable of slight modifications.

The alloys constituted in the manner herein described present special properties dueto their homogeneity and to the presence in the'initial steel of the molybdenum, tungsten or vanadium separately or combined in twos, or all three added together.

The presence of the molybdenum, tung sten or vanadium separately 'or combined in twos or all three added together to the nickel and chromium in the steel, advantageously replaces the high percentage of carbon in the impact face of cemented armor plates, because it makes it possible by any convenient process of tempering to obtain in regard to this face, a hardness sufficient to crush the projectiles and preserve all the desirable malleability in the metallic mass for avoiding cracking on firing.

With the alloys indicated above, homogeneous armor plates may be manufactured without any cementation or addition of special bodies to one face, while at the same time obtaining the proper qualities for resisting the attacks of capped and uncapped projectiles without cracking or scaling, in a more satisfactory manner than the armor plates hitherto known; this improvement is particularly noticeable in the case of the capped projectiles which are employed in all nav1es.

plates, the herein described alloys are capable of numerous uses precisely owmg to their homogeneity and their great resistance.

What I claim is- 1. A steel alloy for armor plates containing in one hundred parts, in addition to iron, carbon 0.3 to 0.5, manganese less than 0.35, nickel 3 to 5,'chromium 0.5 to 1.5, vanadium less than 0.5 and molybdenum less than 1.5.

D 2. A steel alloy for armor plates containmg 1n one hundred parts, in addition to iron,

carbon 0.3 to 0.5, manganese less than 0.35, nickel 3 to 5, chromium 0.5 to 1.5, vanadium less than 0.5, molybdenum less than 1.5, and tungsten less than 3.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

EUGENE SCHNEIDER.

Witnesses DEAN,B. MASON, C. PORTER. 

